EP2857207A1 - Procédé de production d'une image imprimée constituée de sections - Google Patents

Procédé de production d'une image imprimée constituée de sections Download PDF

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Publication number
EP2857207A1
EP2857207A1 EP20140161221 EP14161221A EP2857207A1 EP 2857207 A1 EP2857207 A1 EP 2857207A1 EP 20140161221 EP20140161221 EP 20140161221 EP 14161221 A EP14161221 A EP 14161221A EP 2857207 A1 EP2857207 A1 EP 2857207A1
Authority
EP
European Patent Office
Prior art keywords
dark
column
printing
print
columns
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20140161221
Other languages
German (de)
English (en)
Inventor
Jörg-Achim FISCHER
Berthold Gieß
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP2857207A1 publication Critical patent/EP2857207A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/07—Ink jet characterised by jet control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2146—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding for line print heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/10—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by matrix printers
    • G06K15/102—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by matrix printers using ink jet print heads
    • G06K15/105—Multipass or interlaced printing
    • G06K15/107—Mask selection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/21—Line printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface

Definitions

  • the present invention relates to a method having the features of the preamble of claim 1.
  • the invention is in the technical field of printing by inkjet technology ("inkjet").
  • inkjet heads print substrates or objects that are wider than the print width of the respective heads, it is necessary to use several heads and "stitch" them, i. be positioned and controlled so that the generated pressure paths from pressure points of the individual heads merge to form a seamless print image.
  • Any errors occurring, e.g. visible light or dark lines due to gaps or overlaps of the print dots are called “stitching errors” and are particularly noticeable in rasterized printed images as annoying.
  • the bright lines are almost always recognizable, both in solid and in grid areas and especially in dark areas of the printed image. Dark lines are less noticeable in solid areas, but in grid areas. Such errors should be avoided.
  • the heads are first positioned as accurately as possible.
  • An inventive method for generating a composed of sections print image on an object to be printed with at least two inkjet printheads wherein the print image in a - to the conveying direction of the object at a fixed, from 0 ° and 180 ° different angle extending - y-direction a first print head having first ink jet nozzles generates print dots of the first section and a second print head having second ink jet nozzles generates print dots of the second section, the two sections partially overlapping in an overlap region and potentially forming a light or dark line, is characterized in that, for each of the columns of printing dots extending in the y direction, a first field of printing ink jet nozzles of the first print head and a complementary second field adjacent to the first field print ink-D sen of the second printing head is determined, being defined for each of the runs in the y-direction columns of print dots of the connection of the two fields in the overlap region in a light or dark area of the column.
  • the method according to the invention advantageously makes it possible to connect printing paths of adjacent ink-jet heads to one another in such a way that the connection can no longer be perceived by the human eye.
  • the invention is based on the fact that a (potential) bright line at the junction of two printheads is shifted into bright areas of the printed image and "disappears" there for the human eye. Accordingly, a (potential) dark line can be displaced into dark areas or by mechanical adjustment of a head in the y-direction or by shifting the image data of a head in the y-direction (in each case by one line width of a line of pressure points) are converted into a light line.
  • connection of the printing webs is not varied stochastically, but varies on the basis of an analysis of the present image data in the overlap region of the two inkjet heads.
  • the port is placed in a non-critical area, i. in an area where the connection is no longer visible to the human eye.
  • a potential white line is preferably divided in the x-direction and the parts thereof are placed in the y-direction in light or even white area. The dicing can preferably be done for each individual column of pressure points.
  • a preferred further development of the method according to the invention can be distinguished by the fact that an analysis of the image data of the printed image, in particular in the overlap region, takes place for determining the absolutely brightest or darkest region of the column or the largest contiguous light or dark region of the column.
  • a preferred development of the method according to the invention can be characterized in that a segmentation is carried out to determine the absolutely brightest or darkest region of the column or of the largest contiguous light or dark region of the column.
  • a preferred development of the method according to the invention may be distinguished by the fact that in order to avoid the emergence of perceptible spatial frequencies and / or other perceptible disturbances for some columns of pressure points, the connection of the two fields in the overlap area into the second or third brightest or darkest area of the column or in the second or third largest contiguous light or dark area of the column is placed.
  • a preferred embodiment of the method according to the invention can be characterized in that the light or dark regions of successive columns are selected according to a predetermined function, in particular according to a sine function.
  • a preferred development of the method according to the invention can be characterized in that the light or dark regions of successive columns are selected stochastically.
  • a preferred embodiment of the method according to the invention can be characterized in that in the full-tone areas of the printed image, the connection of the two fields in the overlap region is stochastically placed.
  • a preferred development of the method according to the invention can be distinguished by the fact that the method is carried out iteratively until there are no perceptible disturbances. It can therefore be provided to subject an image analysis (stitching) corrected printed image - iteratively - to one or more further analyzes and corrections and thus to further improve the result.
  • a preferred development of the method according to the invention can be distinguished by the fact that the method is carried out separately for printing multicolored printed images for each color separation and it is checked whether perceptible interference occurs when the printed images are superimposed.
  • the method is carried out separately for printing multicolored printed images for each color separation and it is checked whether perceptible interference occurs when the printed images are superimposed.
  • a method for producing a composite printed image wherein the two sections partially overlap in an overlapping area, characterized in that a bright connection point is placed in a bright area or that a dark connector is placed in a dark area.
  • a printing material processing machine e.g. a printing machine or a printer for printing on flat or curved objects, such as sheets, sheets or packages, which is technically equipped for carrying out the above-mentioned method according to the invention, e.g. Ink jet heads and a controller.
  • packaging equipment or filling equipment with a device which is technically equipped to carry out the above method according to the invention, for example, has ink jet heads and a controller, and the packaging or containers to be filled, eg bottles, printed according to the invention.
  • FIG. 1 Fig. 11 shows first and second ink-jet heads 1a and 1b (hereinafter referred to as "head", for short) with fields 2a and 2b of ink jet nozzles 3a and 3b.
  • head first and second ink-jet heads 1a and 1b (hereinafter referred to as "head", for short) with fields 2a and 2b of ink jet nozzles 3a and 3b.
  • N The number of nozzles per head or the number of corresponding pressure points in the y-direction should be denoted by N.
  • the heads produce a printed image 4 (or its Printing dots) on an object 5 to be printed, preferably on a flat, substantially two-dimensional printing material (eg paper, cardboard, foil as sheet or web) or a three-dimensional body (eg plastic / glass bottle, plastic / cardboard container) ,
  • the print image has in the y-direction a first and a second section 5a and 5b with respective pressure points 6a and 6b, which can each be assigned to a head.
  • the pressure points may also be composed of a plurality of smaller pixels generated by individual ink jet drops.
  • FIG. 1 also shows the conveying direction x of the object and the y-direction at a fixed angle, different from 0 ° and 180 °, to which the heads are arranged in parallel.
  • the angle is about 90 °, but it can also be for example about 45 ° or about 135 °.
  • FIG. 1 recognizable that the two heads and thus also the sections 5a and 5b generated by these overlap in an overlap area 7 (also called "stitching zone") partially.
  • the number of nozzles of each head in the overlap area or the number of corresponding pressure points in the y-direction should be denoted by k.
  • the number of pressure points (eg of the printed image) in the x-direction is denoted by p.
  • the overlap area thus knows k * p pressure points, ie k rows and p columns, on (k in the y direction and p in the x direction).
  • the heads (or at least one of the two heads) can be mechanically adjusted in the y-direction and thus their positioning to each other can be changed, which is indicated by the mechanical correction zone 8. Accordingly, at least one actuator 9 is provided for the adjustment.
  • the print image corresponds to a data record 4 'which contains the image data to be printed, for example in the form of a so-called bitmap.
  • a data set 5a ' corresponds to the first section, a data record 5b' to the second section, and a data record 7 'to the overlap area, where the latter has a size of k * p corresponding to the overlapping area.
  • the two heads are each connected to a controller 10. Also, the actuator (s) are connected to the controller.
  • FIG. 2 shows a flowchart in the event that there is a disturbing white line.
  • step 100 a mechanical adjustment of the heads 1a and 1b is first made.
  • the potential gap (light line) or the potential overlap (dark line) is reduced so far that their width, ie the residual error after completed mechanical correction, smaller than a line width (line of successive pressure points in the x direction) is. It may preferably always be corrected for a residual error with a resulting bright line. In the example described here should therefore be assumed that a bright line. The case of a dark line can be treated accordingly.
  • the provisioning can be done by loading the data from a first memory to a second processing memory.
  • the data can be provided as gray values (eg 0 to g). 0 means "set no pressure point" (ie 0% color), g means “set a pressure point” (ie 100% color).
  • step 102 segmentation
  • the gray values of each column j can be taken together as a gray value curve and the segmentation of this profile leads to a Amount Sp of minima in the course. If no minimum is found for a column j, because, for example, there is a full-tone line, then a minimum is defined at a position i, eg by random selection of i.
  • step 103 determining the absolute minimums
  • step 104 (creating the correction records), two correction records are generated using the record MinS: one for the first and one for the second Head 1a and 1b.
  • the first correction data set contains the image data to be printed of the first head 1a for the overlap region 7.
  • the second correction data set contains the complementary (and therefore subsequent) image data of the second head 1b for the overlap region 7.
  • the connection of the two fields in the overlap region is placed in a light or dark region of the column.
  • the terminal is placed in bright areas and thereby reduced in its perceptibility.
  • the procedure according to the invention is a dark line; this is either changed to a bright line according to step 100 and placed in light areas or left as a dark line and placed in dark areas.
  • FIG. 3a 3 shows an enlarged rasterized printed image 4 (before the correction according to the invention) of printing dots 6a and 6b (illustrated schematically as black squares), which is composed of two sections 5a and 5b.
  • the pressure points form columns p and rows k.
  • the two sections form a connection point 11, which can be seen as a bright line in the printed image. It can also be seen that the width of the junction in the y-direction is less than the width of a pressure point due to the positioning of the printheads (in step 100).
  • FIG. 3b shows the printed image 4, in which the potential bright line of the connection point 11 according to steps 101 to 104 was "broken" and the individual parts (shown schematically as black rectangles) come to rest in the printed image.
  • the procedure according to the invention is not yet completely recognizable, since there are no larger, coherent light areas into which the parts can be addressed, or all light areas are the same size (namely exactly one cell).
  • the procedure of the invention in the FIGS. 4a to 4c is not yet completely recognizable, since there are no larger, coherent light areas into which the parts can be addressed, or all light areas are the same size (namely exactly one cell).
  • Figure 3c shows the same printed image 4, but the parts of the potential bright line are no longer highlighted dark, so that it can be seen how the potential bright line is reduced in the visibility of the human eye. Now, the advantage of the invention is clearly visible.
  • FIG. 4a shows (comparable FIG. 3a ) enlarges a screened printed image 4 (before correction according to the invention) from printing dots 6a and 6b (shown schematically as black units) composed of two sections 5a and 5b.
  • the individual pressure points can be composed of different numbers of pixels.
  • the pressure points form columns p and rows k.
  • the two sections form a connection point 11, which can be seen as a bright line in the printed image. It can also be seen that the width of the junction in the y-direction is less than the width of a pressure point due to the positioning of the printheads (in step 100).
  • FIG. 4b shows (comparable FIG. 3b ) the printed image 4, in which the potential bright line of the connection point 11 according to steps 101 to 104 "broken" and the individual parts (shown schematically as black rectangles) come to rest in the printed image.
  • the black rectangles were addressed in bright areas of the printed image. Instead, stochastic addressing could adversely result in parts of the potential bright line coming to rest in dark areas, eg in the large dark area at the top of the print image. There parts of the bright line would be clearly perceptible to the human eye and therefore the printed image disturbing.
  • a bright area 12 and a dark area 13 are marked.
  • the junctions 11 of the potentially bright line are recognizable and advantageously in the light and not in the dark area.
  • Figure 4c shows (comparable Figure 3c ) the same print image 4, but the parts of the potential bright line are now no longer highlighted dark, so that it can be seen how the potential bright line is reduced in the human eye in their perceptibility.
  • Figure 3c the advantage of the invention is clearly visible here.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Ink Jet (AREA)
  • Record Information Processing For Printing (AREA)
  • Printing Methods (AREA)
EP20140161221 2013-04-26 2014-03-24 Procédé de production d'une image imprimée constituée de sections Withdrawn EP2857207A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201310007294 DE102013007294A1 (de) 2013-04-26 2013-04-26 Verfahren zum Erzeugen eines aus Abschnitten zusammengesetzten Druckbildes

Publications (1)

Publication Number Publication Date
EP2857207A1 true EP2857207A1 (fr) 2015-04-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20140161221 Withdrawn EP2857207A1 (fr) 2013-04-26 2014-03-24 Procédé de production d'une image imprimée constituée de sections

Country Status (5)

Country Link
US (1) US9321260B2 (fr)
EP (1) EP2857207A1 (fr)
JP (1) JP6320152B2 (fr)
CN (1) CN104118214B (fr)
DE (1) DE102013007294A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014223523A1 (de) 2014-11-18 2016-06-02 Krones Ag Verfahren und Vorrichtung für den Tintenstrahldruck auf Behälter
US10293622B2 (en) * 2016-10-25 2019-05-21 Memjet Technology Limited Method of minimizing stitching artifacts for overlapping printhead segments
CN113059915B (zh) * 2019-10-18 2022-02-08 深圳市汉森软件有限公司 喷头重叠孔区域出墨方法、装置及存储介质
CN113696652B (zh) * 2021-08-05 2023-03-24 Tcl华星光电技术有限公司 喷墨打印图案及拼接喷印方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0034060A1 (fr) * 1980-02-08 1981-08-19 The Mead Corporation Imprimante par jet d'encre
US20020057309A1 (en) * 2000-07-25 2002-05-16 Yuichiro Ikemoto Printer and printer head
EP1452313A1 (fr) * 2001-12-03 2004-09-01 Olympus Corporation Appareil d'enregistrement d'images
EP2284009A1 (fr) * 2008-06-09 2011-02-16 Konica Minolta Holdings, Inc. Procédé et dispositif d enregistrement d image

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6563601B1 (en) * 1997-07-28 2003-05-13 Canon Business Machines, Inc. System for printing image data divided at a break point
KR20070121255A (ko) * 2006-06-21 2007-12-27 삼성전자주식회사 어레이형 멀티패스 잉크젯 프린터 및 그의 동작방법
GB0619523D0 (en) * 2006-10-03 2006-11-15 Xaar Technology Ltd Method for printing
JP5343469B2 (ja) * 2008-09-16 2013-11-13 株式会社リコー 画像形成装置及び画像形成方法
WO2011093861A1 (fr) * 2010-01-28 2011-08-04 Hewlett-Packard Development Company, L.P. Impression d'étiquettes
JP5832138B2 (ja) * 2011-05-10 2015-12-16 キヤノン株式会社 インクジェット記録装置およびインクジェット記録方法
JP5811589B2 (ja) * 2011-05-18 2015-11-11 セイコーエプソン株式会社 印刷装置及び印刷方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0034060A1 (fr) * 1980-02-08 1981-08-19 The Mead Corporation Imprimante par jet d'encre
US20020057309A1 (en) * 2000-07-25 2002-05-16 Yuichiro Ikemoto Printer and printer head
EP1452313A1 (fr) * 2001-12-03 2004-09-01 Olympus Corporation Appareil d'enregistrement d'images
EP2284009A1 (fr) * 2008-06-09 2011-02-16 Konica Minolta Holdings, Inc. Procédé et dispositif d enregistrement d image

Also Published As

Publication number Publication date
JP6320152B2 (ja) 2018-05-09
DE102013007294A1 (de) 2014-10-30
US20140320561A1 (en) 2014-10-30
US9321260B2 (en) 2016-04-26
JP2014213608A (ja) 2014-11-17
CN104118214B (zh) 2017-08-08
CN104118214A (zh) 2014-10-29

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